Capacitive gap sensor ring for an input device

ABSTRACT

An input mechanism for a portable electronic device includes a rotational manipulation mechanism, such as a cap or shaft. The input mechanism also includes a sensor having first capacitive elements coupled to the manipulation mechanism, second capacitive elements, and a dielectric positioned between the first and second capacitive elements. Movement of the manipulation mechanism alters the positions of the first and second capacitive elements with respect to each other and is determinable based on capacitance changes resulting therefrom. In some implementations, the second capacitive elements may be part of an inner ring or partial ring nested at least partially within an outer ring or partial ring.

FIELD

The described embodiments relate generally to input devices. More particularly, the present embodiments relate to a capacitive sensor that can detect multiple types of motion of an input device.

BACKGROUND

Electronic devices include a variety of different input and/or output devices for receiving input from and/or providing output to users. Examples of input and/or output devices include keyboards, touch screens, displays, joysticks, microphones, speakers, watch crowns, trackpads, track balls, and so on.

Some input devices include a moveable member and one or more sensors or other components that detect the movement of the moveable member. For example, keyboards may include a number of keycaps that can be pressed to activate one or more switches. Activating a switch may provide input to the electronic device.

SUMMARY

An input mechanism for a portable electronic device includes a manipulation mechanism, such as a cap or shaft that is moveable in multiple directions. The input mechanism also includes capacitive sensors arranged in multiple planes with respect to the manipulation mechanism that are associated with the multiple directions of movement. The capacitive sensors have first capacitive elements coupled to the manipulation mechanism, second capacitive elements, and a dielectric positioned between. Movement of the manipulation mechanism alters the positions of the first and second capacitive elements with respect to each other. The movement is determinable based on capacitance changes that result therefrom.

In various embodiments, a wearable electronic device has a multi-directional input device. The multi-directional input device includes a shaft, a cap operable to move with respect to the shaft, and a sensor coupling the cap to the shaft. The sensor includes an outer set of capacitive elements, an inner set of capacitive elements, a dielectric between the outer and inner sets of capacitive elements, and a returning structure. The returning structure is operable to allow movement of the outer set of capacitive elements with respect to the inner set of capacitive elements and return the outer set of capacitive elements to a default position. In some examples, the dielectric is the returning structure

In some examples, a first element of the outer set of capacitive elements completely overlaps a first element of the inner set of capacitive elements. In other examples, a first element of the outer set of capacitive elements is offset from a first element of the inner set of capacitive elements by a first distance and a second element of the outer set of capacitive elements is offset from a second element of the inner set of capacitive elements by a second distance. The first and second distances may be different.

In numerous examples, the shaft is fixed. In other examples, the shaft is moveable.

In various examples, the dielectric is at least one of silicone or adhesive. In other examples, the dielectric is an air gap.

In some examples, the electronic device is operable to determine rotation of the cap with respect to the shaft, lateral translation of the cap with respect to the shaft, and horizontal translation of the cap with respect to the shaft. The electronic device may determine these movements based on capacitance changes between the outer and inner sets of capacitive elements.

In some embodiments, an electronic device has an input device. The input device includes a rotational manipulation mechanism, a first array of capacitive elements coupled to the manipulation mechanism, a second array of capacitive elements, and a dielectric that couples the first and second arrays of capacitive elements. The dielectric may operate as a seal for the electronic device. Movement of the manipulation mechanism generates capacitance changes between the first and second arrays of capacitive elements.

In various examples, the first array of capacitive elements is included in a first ring. In some implementations of such examples, the second array of capacitive elements is included in a second ring that is at least partially nested within the first ring.

In some examples, movement of the manipulation mechanism may alter at least one of a first overlap area or a first distance between a first pair of the first and second arrays of capacitive elements. Movement of the manipulation mechanism may also alter at least one of a second overlap area or a second distance between a second pair of the first and second arrays of capacitive elements. The first overlap area may be different from the second overlap area. The first distance may be different from the second distance.

In numerous examples, the manipulation mechanism is operable to rotate, press, and slide. In various examples, the first array of capacitive elements has a different number of elements than the second array of capacitive elements. In some examples, the first and second arrays of capacitive elements may experience a change in capacitance in response to a touch on the manipulation mechanism.

In numerous embodiments, an input device includes a fixed structure, a moveable member that is rotatable with respect to the fixed structure, a first set of conductors positioned around the moveable member, and a second set of conductors positioned around the fixed structure to define a gap between the first and second sets of conductors. Capacitance changes between the first and second sets of conductors indicate movement of the moveable element with respect to the fixed structure. At least one of the first set of conductors or the second set of conductors may be curved.

In some examples, a first conductor of the first set of conductors is transverse to a second conductor of the first set of conductors. In various implementations of such examples, a third conductor of the first set of conductors may be transverse to the second conductor of the first set of conductors.

In numerous implementations, the input device is a watch crown. In other implementations, the input device is a joystick. In yet other implementations, the input device may be a variety of different input devices.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements.

FIG. 1 depicts an electronic device having a multi-directional input device.

FIG. 2A depicts a first example cross-sectional view of the multi-directional input device of FIG. 1, taken along line A-A of FIG. 1.

FIG. 2B depicts the multi-directional input device of FIG. 2A during translation.

FIG. 2C depicts a state table illustrating example changes in capacitance of capacitive sensors, with respect to FIGS. 2A and 2B.

FIG. 2D depicts the multi-directional input device of FIG. 2A during rotation.

FIG. 2E depicts a state table illustrating example changes in capacitance of capacitive sensors, with respect to FIGS. 2A and 2D.

FIG. 3A depicts a second example cross-sectional view of the multi-directional input device of FIG. 2A, where outer and inner sets of capacitive elements are offset from each other.

FIG. 3B depicts a state table illustrating example changes in capacitance of capacitors, with respect to FIG. 3A and FIG. 3A with the cap rotated like shown in FIG. 2D.

FIG. 4 depicts a third example cross-sectional view of the multi-directional input device of FIG. 2A where the outer set of capacitive elements includes more elements than the inner set of capacitive elements.

FIG. 5 depicts a fourth example cross-sectional view of the multi-directional input device of FIG. 2A where the inner set of capacitive elements includes more elements than the outer set of capacitive elements.

FIG. 6A depicts a second example cross-sectional view of the multi-directional input device of FIG. 1, taken along line B-B of FIG. 1.

FIG. 6B depicts the multi-directional input device of FIG. 6A upon exertion of a force that translates the cap in a direction approximately perpendicular to the housing.

FIG. 7 depicts another example cross-sectional view of the multi-directional input device of FIG. 6A, where one or more of the outer and inner sets of capacitive elements are offset from each other.

FIG. 8 depicts a fifth example cross-sectional view of the multi-directional input device of FIG. 2A where the dielectric is an air gap and a biasing mechanism.

FIG. 9 depicts a sixth example cross-sectional view of the multi-directional input device of FIG. 2A where the outer ring forms the cap.

FIG. 10 depicts a flow chart illustrating an example method for operating a capacitive sensor for a directional input device. This example method may be performed by the multi-directional input devices of FIGS. 1-9.

DETAILED DESCRIPTION

Reference will now be made in detail to representative embodiments illustrated in the accompanying drawings. It should be understood that the following descriptions are not intended to limit the embodiments to one preferred embodiment. To the contrary, it is intended to cover alternatives, modifications, and equivalents as can be included within the spirit and scope of the described embodiments as defined by the appended claims.

The description that follows includes sample systems, methods, and apparatuses that embody various elements of the present disclosure. However, it should be understood that the described disclosure may be practiced in a variety of forms in addition to those described herein.

The following disclosure relates to an input device that incorporates a moveable member. The moveable member can be manipulated in a variety of directions to provide input. The input device may also include one or more capacitive sensors with groups of capacitive elements positioned around the moveable member. Moving the moveable member may alter positions of some capacitive elements with respect to others, changing capacitances therebetween. The capacitance changes may be used to generate an input signal corresponding to the moveable member's motion.

In a particular embodiment, the sensor may be a ring or partial ring of capacitive elements. The capacitive elements may include an outer set of conductors that is separated from an inner set of conductors by a dielectric. Force exerted to move a shaft, cap, or other structure coupled to the sensor may change the relative position of one or more of the sets of conductors with respect to other sets, changing capacitances therebetween. The dielectric may facilitate the change in relative position, and may return the capacitive elements to a default position after the force stops.

Various embodiments detect movement in a variety of different directions. In some examples, this movement may include translation in one or more directions, rotation, tilt, and so on.

These and other embodiments are discussed below with reference to FIGS. 1-10. However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these Figures is for explanatory purposes only and should not be construed as limiting.

FIG. 1 depicts an electronic device 100 having a multi-directional input device 102, which may incorporate a capacitive sensor as described below. The multi-directional input device 102 may include a cap 103, crown, or other moveable member or rotational manipulation mechanism. The cap 103 may move in various directions when a user exerts force. For example, the cap 103 may rotate with respect to a housing 101 of the electronic device 100, press by translating horizontally toward and/or away from the housing 101, slide by laterally translating in one or more directions approximately parallel to the housing 101, tilt with respect to the housing 101, and so on. The multi-directional input device 102 includes one or more capacitive sensors that detect movement of the cap 103. Information about the movement may be determined based on one or more signals received from the capacitive sensor. For example, a type of motion, direction of motion, non-binary amount of force applied to cause the motion, and so on may be determined based on various capacitive sensor signals.

FIG. 2A depicts a first example cross-sectional view of the multi-directional input device 102 of FIG. 1, taken along line A-A of FIG. 1. In this first example, a capacitive sensor includes an outer ring 240, including an outer set of capacitive elements 210A-210C (or a first array of capacitive elements, first set of conductors, and so on) and an inner ring 241, including an inner set of capacitive elements 211A-211C (or a second array of capacitive elements, second set of conductors, and so on). A dielectric 212 separates and couples the outer and inner sets of capacitive elements 210A-210C, 211A-211C, and defines a gap therebetween. The outer set of capacitive elements 210A-210C is coupled to the cap 103, crown, or other rotational manipulation mechanism and the inner set of capacitive elements 211A-211C is coupled to a fixed shaft 214 or other fixed structure or other component. The outer and inner rings 240, 241 also include a number of spacers 215, 216 (formed of insulating materials such as plastic, polymer, and so on) which respectively isolate the outer and inner sets of capacitive elements 210A-210C, 211A-211C from each other.

The multi-directional input device 102 may include a returning structure. The returing structure may allow the outer set of capacitive elements 210A-210C to move or otherwise alter their position with respect to the inner set of capacitive elements 211A-211C when the cap 103 moves under a force. The returning structure may also return the outer set of capacitive elements 210A-210C to their default positions after the exertion of the force. In this example, the returning structure may be the dielectric 212. The dielectric 212 may be a deformable material, such as silicone or other polymers, suitable gels, foams, adhesive, and so on. The deformable material may allow the outer set of capacitive elements 210A-210C to move or otherwise alter their position with respect to the inner set of capacitive elements 211A-211C and may return the outer set of capacitive elements 210A-210C to their default positions after the exertion of the force.

Movement of the outer set of capacitive elements 210A-210C with respect to the inner set of capacitive elements 211A-211C may change capacitances therebetween. The capacitance between the outer and inner sets of capacitive elements 210A-210C, 211A-211C may be affected by the amount of overlapping area, the distance between the outer and inner sets of capacitive elements 210A-210C, 211A-211C, and so on. In a first example, the outer set of capacitive elements 210A-210C entirely overlap the inner set of capacitive elements 211A-211C and are all the same distance apart. This corresponds to an absence of force exerted on the cap 103. Capacitances, and/or changes in capacitances, between the outer and inner sets of capacitive elements 210A-210C, 211A-211C may be monitored. Any changes in capacitances (or instantaneous values of capacitance) may be analyzed to determine a type of motion of the cap 103, direction of motion of the cap 103, non-binary amount of force applied to cause the motion of the cap 103, and/or other information about motion of the cap 103 with respect to the shaft 214.

Thus, the electronic device 100 (and/or processing unit or other controller thereof) may be operable to determine a variety of different movements of the cap 103 based on the capacitance changes. The electronic device 100 may determine rotation of the cap 103 with respect to the shaft 214 in one or more directions. The electronic device 100 may also determine translation of the cap 103 laterally and horizontally (in reference to FIG. 2A) with respect to the shaft 214 (e.g., in at least two transverse planes, such as a plane parallel to the housing 101 and a plane perpendicular to the housing 101).

The configuration of this first example multi-directional input device 102 may use a relatively small number of components without introducing excessive complexity. Further, the configuration of this first example multi-directional input device 102 may allow watertight or near-watertight sealing between the multi-directional input device 102 and the housing 101, restricting the passage of contaminants such as dust or liquid. In some implementations, the dielectric 212 and/or the sensor itself may function as such a seal or gasket. In other implementations, other seals, gaskets, and so on may also be included.

In some implementations, the outer set of capacitive elements 210A-210C may be drive elements and the inner set of capacitive elements 211A-211C may be sense elements. In other implementations, the drive and sense elements may be reversed. In still other implementations, the drive and sense elements may be intermixed among the outer and inner sets of capacitive elements 210A-210C, 211A-211C. In various implementations, drive elements may be passive.

In this example, the outer and inner sets of capacitive elements 210A-210C, 211A-211C are curved. Further, the outer and inner sets of capacitive elements 210A-210C, 211A-211C are positioned in multiple planes around the cap 103 in complete rings 240, 241, where the inner ring 241 is at least partially nested within the outer ring 240. For example, the outer capacitive element 210C is transverse to the outer capacitive element 210A (e.g., two different planes), which is itself transverse to the outer capacitive element 210B (e.g., a third plane). However, it is understood that this is an example. In various implementations, various capacitive elements may be positioned in different configurations without departing from the scope of the present disclosure, and/or may have any of a variety of shapes. For example, in some implementations, the outer and inner sets of capacitive elements 210A-210C, 211A-211C may be configured in partial rings rather than the complete outer and inner rings 240, 241 shown.

Lateral motion of the cap 103 in a direction 230, or slide motion of the cap 103, will now be described in detail. FIG. 2B depicts the multi-directional input device 102 upon exertion of a force applied by a user 217. This force laterally translates the cap 103 in the direction 230 approximately parallel to the housing 101. Lateral translation causes the outer capacitive element 210A to shift with respect to the inner capacitive element 211A such that they are the same distance apart but have less overlapping area. Lateral translation also causes the outer capacitive element 210B to move apart from the inner capacitive element 211B such that they have the same overlapping area but the distance between has increased. Further, lateral translation causes the outer capacitive element 210C to approach the inner capacitive element 211C such that the overlapping area is the same but the distance between has decreased.

FIG. 2C depicts a state table illustrating example changes in capacitance between the outer and inner sets of capacitive elements 210A-210C, 211A-211C between the states shown in FIGS. 2A and 2B. The capacitances between the outer and inner sets of capacitive elements 210A-210C, 211A-211C in FIG. 2A are all the same value (represented as “X”) because all of outer and inner sets of capacitive elements 210A-210C, 211A-211C are the same distance apart and have the same overlapping area. However, in FIG. 2B, the decreased overlapping area between the outer capacitive element 210A and the inner capacitive element 211A results in a first changed capacitance less than X. Further, the increased distance between the outer capacitive element 210B and the inner capacitive element 211B results in a second changed capacitance that is also less than X. Typically, although not necessarily, the values of the first and second changed capacitances are different. Additionally, the decreased distance between the outer capacitive element 210C and the inner capacitive element 211C results in a third changed capacitance that is greater than X.

These three changed capacitances may be analyzed and compared to each other. Based thereon, the electronic device 100 may determine that the cap 103 has laterally translated in the direction 230 shown in FIG. 2B. The electronic device 100 may also determine the non-binary amount of the force that caused the motion based on the magnitude of the capacitance changes and/or other capacitance change factors.

Although the above describes relative evaluation by looking at capacitive changes to determine motion, it is understood that this is an example. In some implementations, an absolute evaluation of a current capacitance may be used to determine movement without reference to an initial capacitance.

The electronic device 100 may analyze and compare the changed capacitances, or capacitance changes, in a variety of ways. For example, the electronic device 100 may consult one or more lookup tables stored in a non-transitory media in order to correlate the capacitance changes to various types of motion, direction of motion, amount of motion, amount of force, and so on. For example, decreased capacitance on only one side may indicate lateral motion in the opposite direction. By way of another example, decreased capacitance seen by all capacitive elements may indicate rotation.

FIG. 2B depicts left/right, with reference to FIG. 2B, lateral or slide motion of the cap 103. The cap 103 may also move laterally up/down (with reference to FIG. 2B) and this motion may be detected based on capacitances between the outer and inner sets of capacitive elements 210A-210C, 211A-211C. This lateral up/down motion may operate similarly to the left/right lateral motion described above. However, in some implementations, the two motions may be recognized as different types of input. In various implementations, different types of input may be recognized for each different way that the FIG. 2B depicts left/right, with reference to FIG. 2B, lateral or slide motion of the cap 103. The cap 103 may also move laterally up/down (with reference to FIG. 2B) and this motion may be detected based on capacitances between the outer and inner sets of capacitive elements 210A-210C, 211A-211C may move with respect to each other.

Rotation of the cap 103 will now be described in detail. FIG. 2D depicts the multi-directional input device 102 of FIG. 2A upon exertion of a force applied by a user 217 that rotates the cap 103 in a direction 231. This rotation causes all of the outer capacitive elements 210A-210C to shift with respect to the respective inner capacitive elements 211A-211C such that they are the same distance apart but have less overlapping area 232A-232C. FIG. 2E depicts a state table illustrating example capacitances between the outer and inner sets of capacitive elements 210A-210C, 211A-211C, as they are in the state shown in FIG. 2A and in that of FIG. 2D. As discussed above with respect to FIG. 2C, the capacitances between the outer and inner sets of capacitive elements 210A-210C, 211A-211C in FIG. 2A are all the same value, namely X. However, in FIG. 2D, the decreased overlapping area 232A-232C between the outer capacitive elements 210A-210C and the respective inner capacitive elements 211A-211C results in capacitances that are all less than X. These capacitances may be analyzed and compared to each other. Because all three capacitances decrease, the electronic device 100 may determine that the cap 103 has rotated.

In this example, the capacitance changes between the outer and inner capacitive elements 210A-210C, 211A-211C are entirely caused by the changing overlapping area 232A-232C due to rotation. In such a situation, the capacitance changes may not indicate the direction of the rotation as the same amount of rotation in either direction would result in the same change in overlapping area. However, a force exerted to rotate the cap 103 may also translate the cap 103 in a direction opposite the direction of the applied force, at least minimally. As such, gaps (distances) between one or more of the outer and inner capacitive elements 210A-210C, 211A-211C would change and the three capacitance changes would not be precisely identical. These differences between the three capacitances may be analyzed in order to determine the direction of the rotation based on where the gaps are increasing and/or decreasing.

In other implementations, other configurations may be utilized that result in different capacitance changes for different directions of rotation. For example, FIG. 3A depicts a second example cross-sectional view of the multi-directional input device 102 of FIG. 2A where a number of the outer and inner sets of capacitive elements 310A-310C, 311A-311C are offset from each other (e.g., from the respective associated capacitive element 310A-310C, 311A-311C). In this example, the outer capacitive element 310A is offset from the inner capacitive element 311A in a first direction 331 by a first distance whereas the outer capacitive element 310B is offset from the inner capacitive element 311B in an opposite direction 333 by a second distance. The first and second distances may be different. Thus, the capacitive elements 310A, 311A are offset differently than the capacitive elements 310B, 311B.

As a result, the overlapping area (and thus the capacitance) between the outer capacitive element 310A and the inner capacitive element 311A decreases if the cap 303 was rotated in the direction 331 and increases if the cap 303 was rotated in the opposite direction 333. Conversely, the overlapping area (and thus the capacitance) between the outer capacitive element 310B and the inner capacitive element 311B increases if the cap 303 was rotated in the direction 331 and decreases if the cap 303 was rotated in the opposite direction 333. Thus, the three capacitance changes may be analyzed to determine the rotation of the cap 303, the amount of rotation, and the direction of rotation.

FIG. 3B depicts a state table illustrating example changes in capacitance between the outer and inner sets of capacitive elements 310A-310C, 311A-311C between the state shown in FIG. 3A and the state when the cap 303 is rotated in the direction 331. The capacitances between the outer and inner sets of capacitive elements 310A-310C, 311A-311C in FIG. 3A are all different values (represented by “Y,” “Z,” and “X”) because all of the outer and inner sets of capacitive elements 310A-310C, 311A-311C have different overlapping areas. However, upon rotation like shown in FIG. 2D, the further decreased overlapping area between the outer capacitive element 310A and the inner capacitive element 311A results in a capacitance less than Y. Conversely, the increased overlapping area between the outer capacitive element 310B and the inner capacitive element 311B results in a capacitance greater than Z. The decreased overlapping area between the outer capacitive element 310C and the inner capacitive element 311C is the same as in FIG. 2A, less than X.

Although FIGS. 3A-3B illustrate an example configuration that results in different capacitance changes for different directions of rotation, other configurations are possible. For example, FIG. 4 depicts a third example cross-sectional view of the multi-directional input device 102 of FIG. 2A where the outer set of capacitive elements 410A-410D includes more elements than the inner set of capacitive elements 411A-411C.

In this third example, the additional capacitive element 410D may not (or may minimally) capacitively couple with any of the inner set of capacitive elements 411A-411C. However, when the cap 403 is rotated in the direction 431, the capacitive element 410D and the capacitive element 411A may capacitively couple as they begin to overlap. Based on this capacitive change, combined with the decreases in capacitance between the outer and inner sets of capacitive elements 410A-410C, 411A-411C due to the decreased overlap area between those elements, the electronic device 100 may determine that the cap 403 has rotated in the direction 431.

Conversely, when the cap 403 is rotated in the opposite direction 433, the capacitive element 410D may capacitively couple with the capacitive element 411C. As such, this capacitive change, combined with the decreases in capacitance between the outer and inner sets of capacitive elements 410A-410C, 411A-411C due to the decreased overlap area between those elements, indicates the rotation of the cap 403 in the opposite direction.

By way of another possible configuration, FIG. 5 depicts a fourth example cross-sectional view of the multi-directional input device 102 of FIG. 2A where the inner set of capacitive elements 511A-511D includes more elements than the outer set of capacitive elements 510A-510C. In this fourth example, the capacitive element 511D may not (or may minimally) capacitively couple with any of the outer set of capacitive elements 510A-510C. However, when the cap 503 is rotated in the direction 531, the capacitive element 511D and the capacitive element 510A may capacitively couple as they begin to overlap. Based on that capacitive change, combined with the decreases in capacitance between the outer and inner sets of capacitive elements 510A-510C, 511A-511C due to the decreased overlap area between those elements, the electronic device 100 may determine that the cap 503 has rotated in the direction 531.

Conversely, when the cap 503 is rotated in the opposite direction 533, the capacitive element 511D may overlap the capacitive element 510B. As such, the capacitive element 511D and the capacitive element 510B may capacitively couple. This capacitance change, combined with the decreases in capacitance between the outer and inner sets of capacitive elements 510A-510C, 511A-511C due to the decreased overlap area between those elements, indicates the rotation of the cap 503 in the opposite direction 533.

FIG. 6A depicts a second example cross-sectional view of the multi-directional input device 102 of FIG. 1, taken along line B-B of FIG. 1. As shown, one or more of the outer and inner sets of capacitive elements 210A-210C, 211A-211C may be connected to the electronic device 100 (and/or a component thereof, such as a processing unit or other controller) via flex circuits 218A, 218B and/or other conductive materials or communication connections. FIG. 6B depicts the multi-directional input device 102 of FIG. 6A upon exertion of a force by a user 217 that horizontally translates the cap 103 (e.g., in a direction 634 approximately perpendicular to the shaft 214). Horizontal translation of the cap 103 corresponds to a press motion. In this example, the cap 103 horizontally translates toward the shaft 214 and the housing.

Horizontal translation of the cap 103 toward the housing changes the position of the outer and inner sets of capacitive elements 210A-210C, 211A-211C with respect to each other as well as spacers 215, 216. The spacers 215, 216 are also separated by the dielectric 212, and may be omitted in some embodiments. Due to the relative change in position between the outer and inner sets of capacitive elements, the capacitances decrease because the overlapping area decreases. As such, the electronic device 100 may determine from the capacitance changes that the cap 103 has horizontally translated in a direction 634 approximately perpendicular to the housing 101.

However, as all of the outer and inner sets of capacitive elements change relative position by the same amount, the capacitance changes may be the same whether the cap 103 horizontally translates by the same amount toward or away from the housing. In various other implementations, the outer and inner sets of capacitive elements 210A-210C, 211A-211C may be configured such that capacitances change differently between the outer and inner sets of capacitive elements depending on whether the cap 103 moves toward or away from the housing 101. Such configurations may include offsetting one or more of the outer and inner sets of capacitive elements 210A-210C, 211A-211C with respect to each other, such as in the horizontal direction 634 (e.g., approximately perpendicular to the housing 101) and similar to the offsets depicted in the example of FIGS. 3A-3B.

For example, FIG. 7 depicts another example cross-sectional view of the multi-directional input device 102 of FIG. 6A where one or more of the outer and inner sets of capacitive elements 710A-710C, 711A-711C are horizontally offset from each other. As shown, the capacitive elements 710A, 711A are offset in a direction 734. As such, the capacitance between them will change differently depending on whether the cap 703 horizontally translates toward the shaft 714 or away from the shaft 714. In some implementations, one or more other of the outer and inner sets of capacitive elements 710B-710C, 711B-711C may be offset from each other, and may be offset differently than the capacitive elements 710A, 711A.

Although FIG. 7 illustrates an example configuration that results in different capacitance changes for translation toward and away from the housing 101, other configurations are possible. For example, one or more of the outer and inner sets of capacitive elements 710A-710C, 711A-711C may include one or more additional capacitive elements disposed closer to or further from the housing 101 than the outer and inner sets of capacitive elements 710A-710C, 711A-711C similar to the configurations depicted in the examples of FIGS. 4-5.

Additionally or alternatively, multiple rows of outer and inner sets of capacitive elements 210A-210C, 211A-211C may be utilized rather than the single row of outer and inner sets of capacitive elements 210A-210C, 211A-211C shown in FIGS. 2A and 6A-6B. In some examples, two rows of outer and inner sets of capacitive elements 210A-210C, 211A-211C may be positioned and separated from each other in the direction 634 such that the first row is closer to the housing 101 in the direction 634 than the second row. This may allow detection of whether the cap 103 moves towards or away from the shaft 214 based on capacitances between the outer and inner sets of capacitive elements 210A-210C, 211A-211C of the first and second rows. For example, the first row of the outer and inner sets of capacitive elements 210A-210C, 211A-211C and the second row of the outer and inner sets of capacitive elements 210A-210C, 211A-211C may each capacitively couple absent movement of the cap 103 towards or away from the shaft 214. However, these capacitances may decrease as the cap 103 moves towards or away from the shaft 214. Further, the outer capacitive elements 210A-210C of the first row may begin to capacitively couple with the inner capacitive elements 211A-211C of the second row when the cap 103 moves away from the housing 101. Similarly, the outer capacitive elements 210A-210C of the second row may begin to capacitively couple with the inner capacitive elements 211A-211C of the first row when the cap 103 moves toward from the housing 101.

Additionally, first and second rows of outer and inner sets of capacitive elements 210A-210C, 211A-211C may provide multiple sets of capacitances to evaluate. This may provide greater resolution in determining rotation, lateral translation, horizontal translation, and press of the cap 103 with respect to the housing 101.

Moreover, first and second rows of outer and inner sets of capacitive elements 210A-210C, 211A-211C may enable detection of tilt of the cap 103. If a force is exerted to tilt the cap 103 at an angle other than parallel or perpendicular with respect to the shaft 214, capacitances between some of the first and second rows of the outer and inner sets of capacitive elements 210A-210C, 211A-211C would increase due to increased proximity and/or overlap whereas capacitances between others would decrease due to decreased proximity and/or overlap. As the capacitance changes would be different depending on the direction in which the cap 103 was tilted, the capacitance changes may be evaluated to determine the direction and/or amount of the tilt.

FIG. 2A is illustrated and described as including a dielectric 212 that is a deformable material, such as silicone, adhesive, and so on. However, in other implementations, other dielectrics 212 may be used that may operate differently. For example, FIG. 8 depicts a fifth example cross-sectional view of the multi-directional input device 102 of FIG. 2A where the dielectric is an air gap 819 and the device incorporates a biasing mechanism 820.

In this fifth example, the outer and inner sets of capacitive elements 810B-810C, 811B-811C are not directly connected. Instead, they are separated by the air gap 819. Biasing mechanisms 820, such as springs or other elastic elements, couple the spacers 815 and 816. In this example, the biasing mechanisms 820 may be the returning mechanism. The biasing mechanisms 820 bias the outer and inner sets of capacitive elements 810B-810C, 811B-811C in the position shown and operate to return the outer and inner sets of capacitive elements 810B-810C, 811B-811C to the position shown when a force exerted on the cap 803 changes their position.

Further, FIG. 2A is illustrated and described with the cap 103 being separate from the outer ring 240 including the outer set of capacitive elements 210A-210C. However, in various implementations, the cap 103 may be omitted. For example, FIG. 9 depicts a sixth example cross-sectional view of the multi-directional input device 102 of FIG. 2A where the outer ring forms the cap 903.

In this example, the outer ring of the sensor may be directly manipulated by a user to move with respect to the housing 101. As the user or other object contacts the outer ring of the sensor, the user may directly contact one or more of the outer set of capacitive elements 910A-910C. This may influence the capacitances between the outer and inner sets of capacitive elements 910B-910C, 911B-911C. The electronic device 100 may analyze the capacitance changes caused by the user contacting one or more of the outer set of capacitive elements 910A-910C in order to determine various characteristics of movement of the cap 903.

For example, the outer set of capacitive elements 910A-910C may be sense elements. As such, contact by the user with one or more of the outer set of capacitive elements 910A-910C may short the respective element. Based on the detected short, the electronic device 100 may determine a touch location, or where the user is touching the cap. The electronic device 100 may scale and/or otherwise vary how the electronic device 100 interprets the capacitive changes between the outer and inner sets of capacitive elements 910B-910C, 911B-911C based on the detected touch location.

For example, if analysis of the capacitive changes could indicate translation in two opposing directions, the electronic device 100 may determine the cap has translated in the direction opposite the touch location. This is because a user would likely have been unable to move the cap without pushing on the cap from the opposing side.

Additionally, the multi-directional input device 102 of FIG. 2A is described as having a fixed shaft 214. However, in various implementations, the shaft 214 may be operable to move in one or more directions. In some implementations, the shaft 214 may be operable to spin freely. In other implementations, the shaft 214 may be operable to move in response to an additional force exerted on the cap 103 that is greater than the force that moves the outer and inner sets of capacitive elements 910B-910C, 911B-911C.

For example, the shaft 214 may be frictionally mounted, such as with bearings. The frictional mounting may resist more force than does the dielectric 212. The outer and inner sets of capacitive elements 910B-910C, 911B-911C may move with respect to each other under a lesser amount of force than moves the shaft 214. In other words, the outer and inner sets of capacitive elements 910B-910C, 911B-911C may move with respect to each other when a force is exerted. When the force increases sufficiently to also move the shaft 214, the shaft 214 may also move.

FIG. 2A is illustrated and described as a watch crown or similar multi-directional input device 102. However, it is understood that this is an example. In other implementations, the techniques discussed herein may be used with a variety of different input and/or output mechanisms.

For example, a joystick or similar rotational or other input mechanism may include a sensor (such as the one depicted in FIG. 2A) which may be positioned around a shaft (like the shaft 214 in FIG. 2A) that is moveable with respect to a fixed outer element (positioned similarly to the cap 103 in FIG. 2A). Movement of the shaft with respect to the fixed outer element may alter the position of the first and second arrays or sets of capacitive elements or conductors. As such, capacitive differences between the first and second arrays or sets of capacitive elements or conductors may be analyzed and compared to determine movement of the shaft.

By way of another example, a track ball or similar rotational or other input mechanism may include a sensor positioned around a moveable mechanism, such as a sphere or similar element. The sphere may be moveable with respect to a fixed outer element. Movement of the sphere with respect to the fixed outer element, which may be omnidirectional in some implementations, may alter the position of first and second arrays or sets of capacitive elements or conductors, altering capacitive differences that may be analyzed and compared to determine movement of the sphere.

FIG. 2A is illustrated and described as a multi-directional input device 102 that includes capacitive sensors. However, it is understood that this is an example. In other implementations, other kinds of sensors, such as strain gauges, may be used without departing from the scope of the present disclosure.

Further, FIG. 2A is illustrated and described as the outer and inner sets of capacitive elements 210A-210C, 211A-211C being curved and being components of outer and inner rings 240 and 241. However, in various implementations, the outer and inner sets of capacitive elements 210A-210C, 211A-211C may be otherwise configured. For example, the outer and inner sets of capacitive elements 210A-210C, 211A-211C may be flat and may be components of square or other shaped elements rather than the outer and inner rings 240 and 241.

FIG. 10 depicts a flow chart illustrating an example method 1000 for operating a capacitive sensor for a directional input device. This example method 1000 may be performed by the multi-directional input devices of FIGS. 1-9.

At 1010, capacitances between one or more of an outer layer of capacitive elements and an inner layer of capacitive elements may be measured. The layers of capacitive elements may be operable to move with respect to each other based on force exerted on an input mechanism. Movement of the layers of capacitive elements with respect to each other may alter the capacitances.

At 1020, it may be determined whether or not the capacitances have changed. This determination may be performed by a processing unit or other controller that receives signals from a sensor which includes the layers of capacitive elements. If not, the flow returns to 1010 where the capacitances continue to be measured. Otherwise, the flow proceeds to 1030.

At 1030, the various capacitance changes are analyzed and/or compared to determine movement between the outer and inner layers of capacitive elements. This analysis and/or comparison may be performed by a processing unit or other controller. Movement of an input mechanism associated with the layers of capacitive elements may be determined based on the movement of the layers of capacitive elements.

Although the example method 1000 is illustrated and described as including particular operations performed in a particular order, it is understood that this is an example. In various implementations, various orders of the same, similar, and/or different operations may be performed without departing from the scope of the present disclosure.

For example, in some implementations, the example method 1000 may include the additional operation of determining a non-binary amount of the force that was applied to cause the movement of the layers of capacitive elements. In such implementations, the non-binary amount of applied force may be determined based on the capacitance changes.

By way of another example, the layers of capacitive elements are described as outer and inner layers of capacitive elements. However, in various implementations, first or second sets or arrays of capacitive elements or other conductors may be utilized in configurations that are not “outer” or “inner” with respect to each other. In some implementations, the first or second sets or arrays of capacitive elements or other conductors may be adjacent rather than nested or otherwise similarly situated.

Returning to FIG. 1, the electronic device 100 is shown as a wearable electronic device including a display that is coupleable to a user using a band or other attachment mechanism. However, it is understood that this is an example. In various implementations, the electronic device 100 may be any kind of electronic device without departing from the scope of the present disclosure. For example, the electronic device 100 may be a laptop computing device, a smart phone, a desktop computing device, a mobile computing device, a display, a cellular telephone, a digital media player, a fitness monitor, a printer, a tablet computing device, and so on.

Further, the electronic device 100 may include additional components not shown without departing from the scope of the present disclosure. In various examples, the electronic device 100 may include one or more processing units, communication components, sensors, non-transitory storage media (which may take the form of, but is not limited to, a magnetic storage medium; optical storage medium; magneto-optical storage medium; read only memory; random access memory; erasable programmable memory; flash memory; and so on), input/output components, and so on.

As described above and illustrated in the accompanying figures, the present disclosure relates to a capacitive sensor for a directional input device. The input device may include a moveable member that can be manipulated to provide input. The input device may also include one or more sensors with groups of capacitive elements configured in multiple planes around the moveable member. Movement of the moveable member may alter positions of various of the groups of capacitive elements with respect to each other, changing capacitances therebetween. Information about that movement may then be determined based at least on the capacitance changes.

In the present disclosure, the methods disclosed may be implemented as sets of instructions or software readable by a device. Further, it is understood that the specific order or hierarchy of steps in the methods disclosed are examples of sample approaches. In other embodiments, the specific order or hierarchy of steps in the method can be rearranged while remaining within the disclosed subject matter. The accompanying method claims present elements of the various steps in a sample order, and are not necessarily meant to be limited to the specific order or hierarchy presented.

The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of the specific embodiments described herein are presented for purposes of illustration and description. They are not targeted to be exhaustive or to limit the embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings. 

What is claimed is:
 1. A wearable electronic device having a multi-directional input device, comprising: a shaft; a cap operable to move with respect to the shaft; and a sensor coupling the cap to the shaft and comprising: an outer set of capacitive elements; an inner set of capacitive elements; and a dielectric between the outer and inner sets of capacitive elements; and a returning structure operable to: allow movement of the outer set of capacitive elements with respect to the inner set of capacitive elements; and return the outer set of capacitive elements to a default position.
 2. The wearable electronic device of claim 1, wherein a first element of the outer set of capacitive elements completely overlaps a first element of the inner set of capacitive elements.
 3. The wearable electronic device of claim 1, wherein a first element of the outer set of capacitive elements is offset from a first element of the inner set of capacitive elements.
 4. The wearable electronic device of claim 3, wherein: the first element of the outer set of capacitive elements is offset from the first element of the inner set of capacitive elements by a first distance; a second element of the outer set of capacitive elements is offset from a second element of the inner set of capacitive elements by a second distance; and the first and second distances are different.
 5. The wearable electronic device of claim 1, wherein the shaft is moveable.
 6. The wearable electronic device of claim 1, wherein the dielectric comprises at least one of silicone or adhesive.
 7. The wearable electronic device of claim 1, wherein the dielectric comprises an air gap.
 8. The wearable electronic device of claim 1, wherein the electronic device is operable to determine rotation of the cap with respect to the shaft, lateral translation of the cap with respect to the shaft, and horizontal translation of the cap with respect to the shaft based on capacitance changes between the outer and inner sets of capacitive elements.
 9. The wearable electronic device of claim 1, wherein the dielectric is the returning structure.
 10. An electronic device having an input device, comprising: a rotational manipulation mechanism; a first array of capacitive elements coupled to the manipulation mechanism; a second array of capacitive elements; and a dielectric that couples the first and second arrays of capacitive elements; wherein: movement of the manipulation mechanism generates capacitance changes between the first and second arrays of capacitive elements.
 11. The electronic device of claim 10, wherein: the first array of capacitive elements is included in a first ring; and the second array of capacitive elements is included in a second ring that is at least partially nested within the first ring.
 12. The electronic device of claim 10, wherein the dielectric operates as a seal for the electronic device.
 13. The electronic device of claim 10, wherein: movement of the manipulation mechanism alters at least one of a first overlap area or a first distance between a first pair of the first and second arrays of capacitive elements; movement of the manipulation mechanism alters at least one of a second overlap area or a second distance between a second pair of the first and second arrays of capacitive elements; the first overlap area is different from the second overlap area; and the first distance is different from the second distance.
 14. The electronic device of claim 10, wherein the manipulation mechanism is operable to rotate, press, and slide.
 15. The electronic device of claim 10, wherein the first array of capacitive elements has a different number of elements than the second array of capacitive elements.
 16. The electronic device of claim 10, wherein the first and second arrays of capacitive elements experience a change in capacitance in response to a touch on the manipulation mechanism.
 17. An input device, comprising: a fixed structure; a moveable member that is rotatable with respect to the fixed structure; a first set of conductors positioned around the moveable member; and a second set of conductors positioned around the fixed structure to define a gap between the first and second sets of conductors; wherein: capacitance changes between the first and second sets of conductors indicate movement of the moveable element with respect to the fixed structure.
 18. The input device of claim 17, wherein at least one of the first set of conductors or the second set of conductors is curved.
 19. The input device of claim 17, wherein the input device comprises a watch crown.
 20. The input device of claim 17, wherein the input device comprises a joystick. 